Today I installed ccdstack to my laptop computer. Going to countryside and thought to process some old pics there.

Made a test, that everything works. Calibrated one lum frame with maste rdark, master flat and master bias frame.

Work good, but after calibration, lum frame is devided in two by luminosity. Line going straigt from middle of picture. Exactly the same frames works perfect at my desk PC.

Where is problem? See attachement.

line_at_middle.JPG (161 KB, 17 downloads) LUM frame after calibration.

Carefully examine the Dark, Bias Flat and raw-light(s) for that bifurcation. It is virtually impossible for it to appear from nowhere. If you can't find the origin and are able to replicate it then contact me at (stan_ccd at yahoo dot com) to send the raw frames and instruction on exactly how you processed it.

Stan

This message has been edited. Last edited by: Stan,

Stan, thanks for noticing about examine frames. Bias frame was faulty, probably went something wrong, when copyng it to my laptop!
Thanks again!
R